Which of the following groups of devices are only input devices?

Correct option is C

A Joystick, Microphone, and Scanner all send data into the computer, so they are input devices. The other options include output devices, so they are incorrect.
Important Key Points:
1. Input devices send data or signals to the computer.
2. Scanner and microphone convert physical input to digital form.
3. Joystick is used to give directional input.
4. Output devices display results to the user.
Knowledge Booster:
1. Speaker and Monitor are output devices.
2. Printer is also an output device.
3. Light pen and mouse are input devices, but their option group contained output devices mixed in.